U.S. prosecutors had been investigating Signature Bank’s work with cryptocurrency clients before regulators swooped in last weekend, according to Bloomberg. Justice Department investigators in Washington and Manhattan are looking into whether the New York bank did enough to detect potential money laundering by customers, such as scrutinizing who opened accounts and monitoring transactions for signs of crime, the people said. The U.S. Securities and Exchange Commission (SEC) is also looking into the matter, two of the people said, speaking on condition of anonymity. The head of the US SEC said at the time that if violations of federal securities laws were found, they would investigate and take enforcement action.